/* Exception (throw catch) mechanism, for GDB, the GNU debugger.
- Copyright (C) 1986-2014 Free Software Foundation, Inc.
+ Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
#define EXCEPTIONS_H
#include "ui-out.h"
-#include <setjmp.h>
-
-/* Reasons for calling throw_exceptions(). NOTE: all reason values
- must be less than zero. enum value 0 is reserved for internal use
- as the return value from an initial setjmp(). The function
- catch_exceptions() reserves values >= 0 as legal results from its
- wrapped function. */
-
-enum return_reason
- {
- /* User interrupt. */
- RETURN_QUIT = -2,
- /* Any other error. */
- RETURN_ERROR
- };
-
-#define RETURN_MASK(reason) (1 << (int)(-reason))
-
-typedef enum
-{
- RETURN_MASK_QUIT = RETURN_MASK (RETURN_QUIT),
- RETURN_MASK_ERROR = RETURN_MASK (RETURN_ERROR),
- RETURN_MASK_ALL = (RETURN_MASK_QUIT | RETURN_MASK_ERROR)
-} return_mask;
-
-/* Describe all exceptions. */
-
-enum errors {
- GDB_NO_ERROR,
-
- /* Any generic error, the corresponding text is in
- exception.message. */
- GENERIC_ERROR,
-
- /* Something requested was not found. */
- NOT_FOUND_ERROR,
-
- /* Thread library lacks support necessary for finding thread local
- storage. */
- TLS_NO_LIBRARY_SUPPORT_ERROR,
-
- /* Load module not found while attempting to find thread local storage. */
- TLS_LOAD_MODULE_NOT_FOUND_ERROR,
-
- /* Thread local storage has not been allocated yet. */
- TLS_NOT_ALLOCATED_YET_ERROR,
-
- /* Something else went wrong while attempting to find thread local
- storage. The ``struct gdb_exception'' message field provides
- more detail. */
- TLS_GENERIC_ERROR,
-
- /* Problem parsing an XML document. */
- XML_PARSE_ERROR,
-
- /* Error accessing memory. */
- MEMORY_ERROR,
-
- /* Value not available. E.g., a register was not collected in a
- traceframe. */
- NOT_AVAILABLE_ERROR,
-
- /* Value was optimized out. Note: if the value was a register, this
- means the register was not saved in the frame. */
- OPTIMIZED_OUT_ERROR,
-
- /* DW_OP_GNU_entry_value resolving failed. */
- NO_ENTRY_VALUE_ERROR,
-
- /* Target throwing an error has been closed. Current command should be
- aborted as the inferior state is no longer valid. */
- TARGET_CLOSE_ERROR,
-
- /* An undefined command was executed. */
- UNDEFINED_COMMAND_ERROR,
-
- /* Requested feature, method, mechanism, etc. is not supported. */
- NOT_SUPPORTED_ERROR,
-
- /* Add more errors here. */
- NR_ERRORS
-};
-
-struct gdb_exception
-{
- enum return_reason reason;
- enum errors error;
- const char *message;
-};
/* A pre-defined non-exception. */
extern const struct gdb_exception exception_none;
-/* Wrap set/long jmp so that it's more portable (internal to
- exceptions). */
-
-#if defined(HAVE_SIGSETJMP)
-#define EXCEPTIONS_SIGJMP_BUF sigjmp_buf
-#define EXCEPTIONS_SIGSETJMP(buf) sigsetjmp((buf), 1)
-#define EXCEPTIONS_SIGLONGJMP(buf,val) siglongjmp((buf), (val))
-#else
-#define EXCEPTIONS_SIGJMP_BUF jmp_buf
-#define EXCEPTIONS_SIGSETJMP(buf) setjmp(buf)
-#define EXCEPTIONS_SIGLONGJMP(buf,val) longjmp((buf), (val))
-#endif
-
-/* Functions to drive the exceptions state m/c (internal to
- exceptions). */
-EXCEPTIONS_SIGJMP_BUF *exceptions_state_mc_init (volatile struct
- gdb_exception *exception,
- return_mask mask);
-int exceptions_state_mc_action_iter (void);
-int exceptions_state_mc_action_iter_1 (void);
-
-/* Macro to wrap up standard try/catch behavior.
-
- The double loop lets us correctly handle code "break"ing out of the
- try catch block. (It works as the "break" only exits the inner
- "while" loop, the outer for loop detects this handling it
- correctly.) Of course "return" and "goto" are not so lucky.
-
- For instance:
-
- *INDENT-OFF*
-
- volatile struct gdb_exception e;
- TRY_CATCH (e, RETURN_MASK_ERROR)
- {
- }
- switch (e.reason)
- {
- case RETURN_ERROR: ...
- }
-
- */
-
-#define TRY_CATCH(EXCEPTION,MASK) \
- { \
- EXCEPTIONS_SIGJMP_BUF *buf = \
- exceptions_state_mc_init (&(EXCEPTION), (MASK)); \
- EXCEPTIONS_SIGSETJMP (*buf); \
- } \
- while (exceptions_state_mc_action_iter ()) \
- while (exceptions_state_mc_action_iter_1 ())
-
-/* *INDENT-ON* */
-
-
/* If E is an exception, print it's error message on the specified
stream. For _fprintf, prefix the message with PREFIX... */
extern void exception_print (struct ui_file *file, struct gdb_exception e);
const char *prefix,
...) ATTRIBUTE_PRINTF (3, 4);
-/* Throw an exception (as described by "struct gdb_exception"). Will
- execute a LONG JUMP to the inner most containing exception handler
- established using catch_exceptions() (or similar).
-
- Code normally throws an exception using error() et.al. For various
- reaons, GDB also contains code that throws an exception directly.
- For instance, the remote*.c targets contain CNTRL-C signal handlers
- that propogate the QUIT event up the exception chain. ``This could
- be a good thing or a dangerous thing.'' -- the Existential
- Wombat. */
-
-extern void throw_exception (struct gdb_exception exception)
- ATTRIBUTE_NORETURN;
-extern void throw_verror (enum errors, const char *fmt, va_list ap)
- ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 0);
-extern void throw_vfatal (const char *fmt, va_list ap)
- ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 0);
-extern void throw_error (enum errors error, const char *fmt, ...)
- ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 3);
-
/* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception
handler. If an exception (enum return_reason) is thrown using
throw_exception() than all cleanups installed since
projects / platform / upstream / gdb.git / blobdiff